Options:
A.
B.
C.
D.
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Earlier discussion
3 older comments kept for context.
Oluwaseun Adeyemi
Arthropods are covered with a tough, resilient integument or exoskeleton of chitin. Generally, the exoskeleton will have thickened areas in which the chitin is reinforced or stiffened by materials such as minerals or hardened proteins. This happens in parts of the body where there is a need for rigidity or elasticity. Typically the mineral crystals, mainly calcium carbonate, are deposited among the chitin and protein molecules in a process called biomineralization.
John Kenny Ade
Chitin of exoskeleton are strengthened by protein, while cartilage of endoskeleton are strengthened by calcium.
Therefore the answer is B
Oluwaseun Adeyemi
Chitin is a fibrous substance consisting of polysaccharides, which is the major constituent in the exoskeleton of arthropods and the cell walls of fungi. It is strengthened by calcium compounds.